Malicious PDF — malware analysis report

Static analysis result for SHA-256 f858aea42ecbc079…

MALICIOUS

PDF

67.0 KB Created: 2021-02-21 10:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 170dcce5f19ede8cbd89627f4b2f04f0 SHA-1: 8387eca071d920bc7ea0e503e5f216f1b8e0c970 SHA-256: f858aea42ecbc079ee4b3bf3c3629166e5df96c516bc382351c73c41c91ce720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one prominent URL leading to 'baarspo.ru' and another to a large list of PDF links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=sports+illustrated+magazine+subscription+deals
    • http://lnstagram-helping.live/diamonds_of_london_watchesk7se4.pdf
    • https://static.s123-cdn-static.com/uploads/4495262/normal_5fffdf4787e0c.pdf
    • http://mkr-olimp.info/new_american_standard_ultrathin_reference_bible_black_genuine_leatherbzmui.pdf
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5fe77660a5c34.pdf
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/gozabupewe_lukuvoragi_tinusezobuji.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/af631.pdf
    • https://kowirakixodoxe.weebly.com/uploads/1/3/4/4/134467502/c3cf64f9e.pdf
    • https://cdn-cms.f-static.net/uploads/4454426/normal_600be5c612fbb.pdf
    • https://static.s123-cdn-static.com/uploads/4423155/normal_5ff06c98c9905.pdf
    • https://cdn-cms.f-static.net/uploads/4422637/normal_601e03f6b9fe4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jexijer/windows_media_player_classic_for_android.pdf
    • https://s3.amazonaws.com/zinudipir/how_to_construct_an_isosceles_triangle_with_given_perimeter_and_altitude.pdf
    • https://s3.amazonaws.com/dubiditiginowo/9970464948.pdf
    • https://s3.amazonaws.com/kevava/cisco_room_kit_plus_ordering_guide.pdf
    • https://s3.amazonaws.com/regufojalojaza/cyber_security_vs._information_security.pdf
    • https://s3.amazonaws.com/wizidimawag/duxosikijudipad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca4f.bin
a5055620234c7d5fb267aef6b77d12a4e76801be8563cc8428dc90dd94afe93a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4F 5684 bytes
font_01_sfnt_off0000dd95.bin
81f6185c70f0148c3596508747dffe9f89ca993a24bf815d2059ce5f490fbdb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 11100 bytes